What is the most abundant gas in the air?
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What is the most abundant gas in the air?
The most abundant gas in the earth's atmosphere is nitrogen.
True or False?
The atmosphere consists of approximately 80% oxygen.
False.
Oxygen makes up approximately 20% of the earth's atmosphere, with nitrogen making up approximately 80%.
Give the percentage of nitrogen in the air.
The approximate percentage of nitrogen in the air is 78-80%.
Name two gases found in small proportions in the Earth's atmosphere.
Gases found in small proportions in the Earth's atmosphere include:
carbon dioxide
water vapour
noble gases
Name two gases found in the Earth's early atmosphere.
Gases found in the Earth's early atmosphere included:
carbon dioxide
water vapour
methane
nitrogen
hydrogen
ammonia
Describe how the oceans formed.
The oceans formed when water vapour in the air condensed.
What was the main source of gases in the early atmosphere?
The main source of gases in the early atmosphere were volcanoes.
True or False?
The early atmosphere contained high amounts of oxygen.
False.
The early atmosphere contained little or no oxygen.
True or False?
The Earth's early atmosphere may have been like the atmospheres of Mars and Saturn today.
False.
The Earth's early atmosphere may have been like the atmospheres of Mars and Venus today.
Name the main gas that was found in the Earth's early atmosphere.
The main gas that was found in the Earth's early atmosphere was carbon dioxide.
Why is it difficult to gather evidence about the early atmosphere?
It is difficult to gather evidence about the early atmosphere because it happened 4.6 billion years ago.
True or False?
Carbon dioxide dissolved in the newly formed oceans.
True.
Carbon dioxide dissolved in the newly formed oceans.
Why have oxygen levels increased since the early atmosphere?
Oxygen levels increased since the early atmosphere because plants and algae evolved and gave it out by photosynthesis.
True or False?
Algae first produced oxygen approximately 4.6 billion years ago.
False.
Algae first produced oxygen approximately 2.7 billion years ago.
Write the word equation for photosynthesis.
The word equation for photosynthesis is:
carbon dioxide + water → glucose + oxygen
Write the balanced symbol equation for photosynthesis.
The balanced symbol equation for photosynthesis is:
6CO2 + 6H2O → C6H12O6 + 6O2
True or False?
An increase in oxygen levels enabled animals to evolve.
True.
An increase in oxygen levels enabled animals to evolve.
Explain why the percentage of carbon dioxide in the atmosphere decreased.
The percentage of carbon dioxide in the atmosphere decreased because:
Algae and plants took it in for photosynhtesis
It dissolved in the ocean
Carbon became locked in sedimentary rock
Carbon became locked in fossil fuels
Describe what has happened to the level of nitrogen in the atmosphere over the last 4.5 billion years.
The levels of nitrogen has increased over the last 4.5 billion years.
True or false?
Carbon dioxide gas dissolves in water.
True.
Carbon dioxide gas dissolves in water.
Describe what has happened to the level of , carbon dioxide in the atmosphere over the last 4.5 billion years.
The levels of carbon dioxide have decreased over the last 4.5 billion years.
Name three fossil fuels which contain carbon.
Three fossil fuels which contain carbon are crude oil, natural gas and coal
How did sediments form?
Sediments formed when the carbonates formed from the dissolving of carbon dioxide in the ocean precipitated.
Describe what has happened to the level of oxygen in the atmosphere over the last 4.5 billion years.
The levels of oxygen have increased over the last 4.5 billion years.